Abstract:
:Conventional epitaxy of semiconductor films requires a compatible single crystalline substrate and precisely controlled growth conditions, which limit the price competitiveness and versatility of the process. We demonstrate substrate-tolerant nano-heteroepitaxy (NHE) of high-quality formamidinium-lead-tri-iodide (FAPbI3) perovskite films. The layered perovskite templates the solid-state phase conversion of FAPbI3 from its hexagonal non-perovskite phase to the cubic perovskite polymorph, where the growth kinetics are controlled by a synergistic effect between strain and entropy. The slow heteroepitaxial crystal growth enlarged the perovskite crystals by 10-fold with a reduced defect density and strong preferred orientation. This NHE is readily applicable to various substrates used for devices. The proof-of-concept solar cell and light-emitting diode devices based on the NHE-FAPbI3 showed efficiencies and stabilities superior to those of devices fabricated without NHE.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Lee JW,Tan S,Han TH,Wang R,Zhang L,Park C,Yoon M,Choi C,Xu M,Liao ME,Lee SJ,Nuryyeva S,Zhu C,Huynh K,Goorsky MS,Huang Y,Pan X,Yang Ydoi
10.1038/s41467-020-19237-3subject
Has Abstractpub_date
2020-11-02 00:00:00pages
5514issue
1issn
2041-1723pii
10.1038/s41467-020-19237-3journal_volume
11pub_type
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